Compositions containing ground vulcanized rubber and high melt flow polymer
a technology of polymer and vulcanized rubber, which is applied in the field of thermoplastic compositions, can solve the problems of piles of tires burning for months, black smoke and strong odor, piles of tires can burn for months, etc., and achieve high melt flow index, improved compatibility, and improved toughness.
Inactive Publication Date: 2016-04-21
GONZALEZ EDGAR A
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- Abstract
- Description
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- Application Information
AI Technical Summary
Benefits of technology
[0005]In accordance to this invention, it has been discovered that thermoplastic compositions comprising a blend of ground vulcanized rubber, alpha olefin copolymer and a high melt flow index homopolymer polypropylene polymer of about 30 melt flow index (230° C. / 2.16 kg) or above unexpectedly have improved toughness, flow and surface appearance compared to blends of similar composition containing a copolymer of polypropylene and ethylene of similar or lower melt flow index (230° C. / 2.16 kg) or a homopolymer polypropylene of significantly lower melt flow index (230° C. / 2.16 kg). The improved properties of the compositions of the present invention indicate improved compatibility between the ground vulcanized rubber and the other components in the blend. More specifically, improved thermoplastic compositions of the invention comprise (a) ground vulcanized rubber in the form of small dispersed particles, (b) alpha olefin copolymer and (c) high melt flow index homopolymer polypropylene polymer of about 30 melt flow index (230° C. / 2.16 kg) or above, and, if desired, additives such as fillers, pigments, reinforcements, stabilizers, processing aids, colorants, plasticizers and other compounding or modifying ingredients may be included in order to meet specific performance needs of each customer.
[0006]The melt processability of these compositions allows shaped articles of these compositions to be molded there from without the time consuming cure step required with conventional thermoset rubbers, thereby, reducing finished part cost.
Problems solved by technology
Above ground storage of tires presents a fire and health hazard.
Once ignited, a pile of tires can burn for months, polluting the air with black smoke and strong odor.
Method used
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Experimental program
Comparison scheme
Effect test
example 1
[0015]The vulcanized rubber particles were obtained by grinding ethylene-propylene-diene monomer (EPDM) rubber scrap from recycled hoses and gaskets. The average particle size was 0.5 mm. The rubber particles, alpha olefin copolymer and high melt flow index homopolymer polypropylene polymer were mixed in a Banbury mixer at 180-190 C for five minutes. After blending and pelletizing, to demonstrate that the compositions were melt processable, each batch was injection molded into a four inch disc 2.0 mm thick. The molded disc was rapidly cooled under pressure to ambient temperature and removed from the press.
[0016]Test specimens were die cut from the molded disc and used after 24 hours storage at room temperature. The molded disc samples were re-melt processable.
[0017]The stress-strain properties of the compositions are determined in accordance with the procedures set forth in ASTM D-412. Test specimens are pulled with an Instron Tester at 20.0 inches per minute to failure. The propert...
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Abstract
Improved thermoplastic compositions comprising a blend of ground vulcanized rubber and an alpha olefin copolymer which have improved compatibility and properties are described; they are improved by incorporation of a high melt flow index polypropylene homopolymer.
Description
TECHNICAL FIELD[0001]This invention relates to improved thermoplastic compositions which, while having the processability of a thermoplastic polymer, are elastomeric in nature. The result of this invention is accomplished by melt mixing ground vulcanized rubber with an alpha olefin copolymer in the presence of a high melt flow index homopolymer polypropylene polymer.DESCRIPTION OF THE PRIOR ART[0002]Thermoplastic compositions consisting of blends of ground vulcanized rubber and thermoplastic polymer are known; for example see U.S. Pat. No. 6,031,009. That patent discloses improved compositions comprising a blend of ground vulcanized rubber and olefin polymer obtained by the incorporation of an alpha olefin copolymer. However, there is a definite need for improved blends of ground vulcanized rubber and thermoplastic polymer in light of the large number of discarded tires and waste rubber articles which are not being reclaimed. As will be shown in a comparative example below the mecha...
Claims
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IPC IPC(8): C08L17/00
CPCC08L17/00C08L2207/20C08L2205/03C08L23/16C08L23/0807C08L23/12C08L23/142
Inventor GONZALEZ, EDGAR A
Owner GONZALEZ EDGAR A
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